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in Appendix D, this occurs within five years of refuse placement with periodic <br /> spikes that follow and which may be related to variable annual rainfall. Within a <br /> one-acre landfill area, the peak daily leachate generation amounts to <br /> approximately 4,073 gallons or approximately 0.006 cubic feet per second (cfs). <br /> The peak daily head on the liner system was calculated to be approximately 1.6 <br /> inches Accordingly, the 200-foot spacing of the LCRS appears more than <br /> adequate to keep less than one-foot of leachate head on the liner. <br /> LCRS Pipe Capacity <br /> Since the largest tributary area within the planned new liner system is <br /> approximately 23 acres, the peak daily flow through leachate collector pipes to <br /> the leachate sumps will be approximately 0.14 cfs. Recognizing that 27CCR <br /> regulations require that the LCRS pipes be designed to accommodate double the <br /> peak daily leachate generation rate, the LCRS pipe at the facility should be <br /> designed to accommodate approximately 0.28 cfs. The maximum capacity of a <br /> 6-inch diameter mainline LCRS pipe at a two percent slope is 1.03 cfs, therefore <br /> the factor of safety is 36.78, for the proposed 6-inch diameter LCRS mainlines <br /> (see Appendix D for supporting calculations). <br /> 5.3.6 SURFACE WATER CONTROL <br /> The drainage system calculations are included in Appendix G and a hydrology <br /> map is shown on Drawing 10. Storm water runoff volumes were calculated and <br /> final storm water drainage control facilities were sized using the Rational Method <br /> and the design criteria in 27 CCR, Section 20320. The Rational Method used to <br /> calculate the runoff peaks and to size the control facilities is as follows: <br /> q = CiA <br /> Where q = Peak runoff rate, cfs <br /> C = Runoff coefficient <br /> i = Rainfall intensity for the design return period (1,000-year return) and <br /> for a duration equal to the time of concentration of the watershed, <br /> in/hr <br /> A = Watershed area, acres <br /> The runoff coefficient and rainfall data used were based on criteria in the County <br /> of San Joaquin Hydrology Manual. The runoff coefficient incorporates the effects <br /> Forward Landfill)TD 5-24 <br /> L\Allied\2000.193\ReporlsUTD-PCPCMP702 Sec-5.0:5/24/02 <br /> Revision 1:07/16,/02 <br /> BRYAN A.STIRRAT S ASSOCIATES <br />